Disposable oven liner



p 1965 J. MARINACE 3,207,148

DISPOSABLE OVEN LINER Filed Feb. 15, 1963 8 m]l|I|Il!llHl I INVENTOR. JO PHINE HARINACE AT TORNE YS United States Patent Filed Feb. 15, 1963, Ser. No. 258,779 Claims. (Cl. 126-19) The present invention relates to disposable oven liners and to improved ovens containing novel disposable liners.

The cleaning of ovens involving removal of various greases and/or other food particles, particularly in small ovens of the type used in the home and small commercial establishments, is a difficut and onerous task. The deposits are tenaciously adherent to the walls, floor, and/ or roof of the oven. The usual commercial cleaning compositions are strongly alkaline and dangerous if improperly used. Housewives often find this work so difficult or distasteful that they often rely on carbonizing the deposits with consequent production of smoke and fumes. A need exists for an oven in which the walls, floor, and roof, etc. are so constructed that dirt is easily removed therefrom.

It is an object of the present invention to provide dis posable oven linings used in the preparation of improved ovens. It is also an object of the present invention to provide an improved oven having disposable oven liners.

FIGURE 1 is a view of a roll of aluminum foil having one surface coated with an adhesive;

FIGURE 2 is a front elevation of an oven having a partially breakaway section; and

FIGURE 3 is a section of a laminate oven wall.

Referring to the drawings in greater detail, there is shown an oven having a door 1, a right side wall 2, a floor 3, and a back wall 4. The oven also contains a tray 5. The tray 5 is supported by shelf supports 6. In the breaking portion of the oven illustrated, the side wall 2, the back wall 4 and the floor 3 are all laminates of a permanent oven wall 7 and aluminum foil 8. The foil 8 is bonded to the permanent wall with an adhesive 9 which is illustrated by the heavy line in FIG. 3, and depicted on the surface of the aluminum in FIG. 1. The foil 8 is illustrated partially pulled away from the permanent wall 7 at the upper portion of FIG. 3. The aluminum foil covers all, or a major part, of the permanent walls, including shelf supports 6, corrugations, etc. FIG. 1 illustrates a roll 10 of aluminum foil having one surface 9 covered with adhesive. The foil may be torn along perforations 11 to obtain rectangular sections 12 of a size common to many oven walls, floors, etc.

I discovered that a lined oven having disposable linings is easily cleaned by removing and disposing of the wall linings. The walls, the roof and the floor of the lined oven are laminates of (i) a permanent wall of the oven chamber, usually metal, and (ii) an inner disposable wall of aluminum foil which is bonded to the permanent wall with a pressure-sensitive adhesive.

The housewife or other user of the oven may prepare the lined oven from aluminum foil having the pressure sensitive adhesive on one surface thereof. The foil is cut or trimmed roughly to the size and shape of the surface of the oven which is to be covered. It is applied to the Wall with gentle pressure (hand pressure usually being sufficient) over the surface to be protected, including corrugations, shelf supports, indentations, etc. of the nature commonly found in oven walls, doors, roof, floors, etc.

The improved lined ovens having the disposable wall linings are generally of the type found in households and commercial establishments. The oven may be part of the usual household range or a separate wall installation. The terms oven and oven chamber include ovens having the heat source external to the oven chamber and also ovens having the heat source in the oven chamber.

The aluminum foil useful in preparing the disposable oven linings should be thin and flexible. The aluminum foils commercially available are satisfactory. The limiting maximum thickness is that in which the foil becomes insufiiciently flexible to apply the coated foil to the oven walls and cover shelf supports, etc. The minimum thickness is that at which the foil retains suflicient tensile strength so that it may be removed from the permanent oven wall by hand pressure without tearing, i.e. the tensile strength must be in excess of the strength of the laminate bond. The coating on one side of the aluminum foil may cover substantially the entire surface or it may only cover a portion of the surface, usually in the form of a pattern of strips, a grid, a series of dots, etc. Suflicient adhesive should be present to secure the foil to the permanent wall oven. The aluminum sheet may be perforated or contain indentations to facilitate tearing or cutting by the housewife. Such preferred sections would be of square or rectangular shape and sized to fit the most widely used ovens.

The adhesive should be one which will bond the aluminum to the permanent Wall of the oven which is usually steel. It must be heat resistant so that it will retain its adhesive qualities at the oven temperatures of 400-500 F. and often locally considerably higher. In addition it must not set to a permanent bond at these temperatures, so that the disposable aluminum foil may be removed from the permanent wall by lifting an edge of the foil from the wall and then peeling the foil from the wall. Such adhesives are usually tacky. To facilitate sale and storage of the disposable liner in the form of rolled or stacked sheet material, the adhesive should be one which is easily separated from a facing material which is used to coat the adhesive during packing. An alternative embodiment of the disposable liner involves a roll or stack of aluminum foil using an adhesive which does not adhere with tenacity to the back or uncoated surface of the aluminum foil which may be treated to prevent adhesion. Silicone greases and fluorocarbon greases generally meet the requirements.

Preferred adhesives are the silicone based materials, such as dimethyl-, diethyland diphenylpolysiloxanes. These are often compounded with a metal soap such as lithium stearate or laurate, sodium oleate, etc. Often the adhesive composition contains a small amount of an emulsifying agent such as a quaternized amine. A preferred composition contains about of a silicone, and about 10% of a lithium soap. The composition may also contain up to 2 or 3% of a quaternized amine emulsifying agent. For ease of application to the aluminum, the adhesive may also contain a solvent. However, the solvent should be removed to prevent smoking in the oven. The silicone greases have sufiicient stiffness or body to remain adherent and tacky while on the aluminum. Inert high temperature, fillers such as silica, asbestos, Bentonite, and diatomaecous earth, may be compounded with the silicone to obtain the requisite body. Dow Corning Valve Seal, Dow Corning ll-Compound" and 27 1 Adhesive are examples of commercially available and useful greases and adhesives; the former two being preferred.

Though the invention has been described with reference to only specific embodiments, it is to be understood that variations thereof may be adopted without departing from its spirit or scope.

What is claimed is:

1. A lined oven having disposable wall linings comprising an oven chamber having laminate walls, each wall comprising a laminate of (i) a permanent wall of the chamber, and

(ii) an inner disposable liner of aluminum foil bonded 3 to the permanent wall with a pressure-sensitive adhesive, said adhesive being stable to oven heat.

2. The lined oven of claim 1 wherein the floor is also a laminate of the type described.

3. The lined oven of claim 2 wherein the roof is also a laminate of the type described.

4. An oven having an' ovenchamber enclosed by five fixed surfaces and one movable surface, at least one of said surfaces comprising alaminate of,

(i) a permanent wall of the chamber, and

(ii) an inner disposable liner of aluminum foil bonded to the permanent wall-with a pressure-sensitive adhesive, said adhesive being stable tojoven heat.

5; The oven of'claim 4iwherein the adhesive used to bond the aluminum foil to the permanent wall is a tacky silicone grease.

References Cited by the Examiner UNITED STATESPATENTS JAMES W. WESTHAVER, Primary Examiner. 

1. A LINED OVEN HAVING DISPOSABLE WALL LININGS COMPRISING AN OVEN CHAMBER HAVING LAMINAT, WALLS, EACH WALL COMPRISING A LAMINATE OF (I) A PERMANENT WALL OF THE CHAMBER, AND (II) AN INNER DISPOSABLE LINER OF ALUMINUM FOIL BONDED TO THE PERMANENT WALL WITH A PRESSURE-SENSITIVE ADHESIVE, SAID ADHESIVE BEING STABLE TO OVEN HEAT. 